diff --git a/autotest/t016_test.py b/autotest/t016_test.py
index 31a7850ba6..ec06ba4b93 100644
--- a/autotest/t016_test.py
+++ b/autotest/t016_test.py
@@ -256,6 +256,30 @@ def test_usg_rch_evt_models02a():
         success, buff = m.run_model()
         assert success
 
+def test_usg_ss_to_tr():
+    # Test switching steady model to transient
+    # https://github.com/modflowpy/flopy/issues/1187
+    model_ws = os.path.join(
+        "..", "examples", "data", "mfusg_test", "01A_nestedgrid_nognc"
+    )
+    nam = "flow.nam"
+    m = flopy.modflow.Modflow.load(
+        nam, model_ws=model_ws, version="mfusg", exe_name=v
+    )
+    m.model_ws = tpth
+    m.disu.steady = [False]
+    m.write_input()
+    if run:
+        success, buff = m.run_model()
+        assert success
+
+    m = flopy.modflow.Modflow.load(
+        nam, model_ws=tpth, version="mfusg", exe_name=v
+    )
+    if run:
+        success, buff = m.run_model()
+        assert success
+
 
 if __name__ == "__main__":
     test_usg_disu_load()
@@ -266,3 +290,4 @@ def test_usg_rch_evt_models02a():
     test_usg_rch_evt_models01()
     test_usg_rch_evt_models02()
     test_usg_rch_evt_models02a()
+    test_usg_ss_to_tr()
diff --git a/flopy/pakbase.py b/flopy/pakbase.py
index 67ae0d318e..20870b4301 100644
--- a/flopy/pakbase.py
+++ b/flopy/pakbase.py
@@ -399,7 +399,7 @@ def _check_storage(self, chk, storage_coeff):
                         [sarrays["sy"][sl] for sl in node_k_slices]
                     ).flatten()
                     active = np.asarray(
-                        [active[sl] for sl in node_k_slices]
+                        [active[sl] for sl in node_k_slices], dtype=bool
                     ).flatten()
                 else:
                     sarrays["sy"] = sarrays["sy"][inds, :, :]